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  <font size="+3">&#8592;</font> <a href="https://hosseinmoein.github.io/DataFrame/docs/HTML/DataFrame.html">Back to Documentations</a><BR><BR>
  
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      <th>Signature</th> <th>Description</th> <th>Parameters</th>
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<pre class="code_syntax" style="color:#000000;background:#ffffff00;"><span class="line_wrapper"><span style="color:#004a43; ">#</span><span style="color:#004a43; ">include </span><span style="color:#800000; ">&lt;</span><span style="color:#40015a; ">DataFrame/DataFrameFinancialVisitors.h</span><span style="color:#800000; ">&gt;</span></span>
<span class="line_wrapper"></span>
<span class="line_wrapper"><span style="color:#800000; font-weight:bold; ">template</span><span style="color:#800080; ">&lt;</span><span style="color:#800000; font-weight:bold; ">typename</span> T<span style="color:#808030; ">,</span> <span style="color:#800000; font-weight:bold; ">typename</span> I <span style="color:#808030; ">=</span> <span style="color:#800000; font-weight:bold; ">unsigned</span> <span style="color:#800000; font-weight:bold; ">long</span><span style="color:#808030; ">,</span></span>
<span class="line_wrapper">         <span style="color:#666616; ">std</span><span style="color:#800080; ">::</span><span style="color:#603000; ">size_t</span> A <span style="color:#808030; ">=</span> <span style="color:#008c00; ">0</span><span style="color:#800080; ">&gt;</span></span>
<span class="line_wrapper"><span style="color:#800000; font-weight:bold; ">struct</span> BalanceOfPowerVisitor<span style="color:#800080; ">;</span></span>
<span class="line_wrapper"></span>
<span class="line_wrapper"><span style="color:#696969; ">// -------------------------------------</span></span>
<span class="line_wrapper"></span>
<span class="line_wrapper"><span style="color:#800000; font-weight:bold; ">template</span><span style="color:#800080; ">&lt;</span><span style="color:#800000; font-weight:bold; ">typename</span> T<span style="color:#808030; ">,</span> <span style="color:#800000; font-weight:bold; ">typename</span> I <span style="color:#808030; ">=</span> <span style="color:#800000; font-weight:bold; ">unsigned</span> <span style="color:#800000; font-weight:bold; ">long</span><span style="color:#808030; ">,</span></span>
<span class="line_wrapper">         <span style="color:#666616; ">std</span><span style="color:#800080; ">::</span><span style="color:#603000; ">size_t</span> A <span style="color:#808030; ">=</span> <span style="color:#008c00; ">0</span><span style="color:#800080; ">&gt;</span></span>
<span class="line_wrapper"><span style="color:#800000; font-weight:bold; ">using</span> bop_v <span style="color:#808030; ">=</span> BalanceOfPowerVisitor<span style="color:#800080; ">&lt;</span>T<span style="color:#808030; ">,</span> I<span style="color:#808030; ">,</span> A<span style="color:#800080; ">&gt;</span><span style="color:#800080; ">;</span></span>
<span class="line_wrapper"></span></pre>
      </td>
      <td>
        This is a "single action visitor", meaning it is passed the whole data vector in one call and you must use the single_act_visit() interface.<BR><BR>
        This visitor calculates the balance of power indicator. It requires 4 input columns in the order of <I>low, high, open, close</I>.<BR>
        The result is a vector of values with same number of items as the given columns. The first <I>roll_peiord - 1</I> items, in the result will be NAN, if <I>rolling_avg</I> is true.<BR><BR>
        Balance of Power (BOP) is a price-based indicator used by technical analysts to evaluate the overall strength of buyers and sellers in the market. BOP oscillates around zero line, where positive values indicate Bull market dominance and negative values indicate Bear market dominance. On its own, BOP is not a particularly smooth indicator, and is therefore best paired with an indicator that can counter this by providing essential smoothness. By pairing the BOP with the Simple Moving Average, for example, the result is a smooth, proper analysis for viewing.<BR>
        <I>
        <PRE>
    explicit
    BalanceOfPowerVisitor(bool rolling_avg = false,
                          size_t rolling_period = 14);

    <B>rolling_avg</B>: Apply rolling average to the result vector
    <B>rolling_period</B>: Rolling average period
        </PRE>
        </I>
      </td>
      <td width="30%">
        <B>T</B>: Column data type<BR>
        <B>I</B>: Index type<BR>
        <B>A</B>: Memory alignment boundary for vectors. Default is system default alignment<BR>
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  </table>

<pre style='color:#000000;background:#ffffff00;'><span style='color:#800000; font-weight:bold; '>static</span> <span style='color:#800000; font-weight:bold; '>void</span> test_BalanceOfPowerVisitor<span style='color:#808030; '>(</span><span style='color:#808030; '>)</span>  <span style='color:#800080; '>{</span>

    <span style='color:#666616; '>std</span><span style='color:#800080; '>::</span><span style='color:#603000; '>cout</span> <span style='color:#808030; '>&lt;</span><span style='color:#808030; '>&lt;</span> <span style='color:#800000; '>"</span><span style='color:#0f69ff; '>\n</span><span style='color:#0000e6; '>Testing BalanceOfPowerVisitor{  } ...</span><span style='color:#800000; '>"</span> <span style='color:#808030; '>&lt;</span><span style='color:#808030; '>&lt;</span> <span style='color:#666616; '>std</span><span style='color:#800080; '>::</span><span style='color:#603000; '>endl</span><span style='color:#800080; '>;</span>

    <span style='color:#800000; font-weight:bold; '>typedef</span> StdDataFrame<span style='color:#800080; '>&lt;</span><span style='color:#666616; '>std</span><span style='color:#800080; '>::</span><span style='color:#603000; '>string</span><span style='color:#800080; '>></span> StrDataFrame<span style='color:#800080; '>;</span>

    StrDataFrame    df<span style='color:#800080; '>;</span>

    <span style='color:#800000; font-weight:bold; '>try</span>  <span style='color:#800080; '>{</span>
        df<span style='color:#808030; '>.</span>read<span style='color:#808030; '>(</span><span style='color:#800000; '>"</span><span style='color:#0000e6; '>data/SHORT_IBM.csv</span><span style='color:#800000; '>"</span><span style='color:#808030; '>,</span> io_format<span style='color:#800080; '>::</span>csv2<span style='color:#808030; '>)</span><span style='color:#800080; '>;</span>

        bop_v<span style='color:#800080; '>&lt;</span><span style='color:#800000; font-weight:bold; '>double</span><span style='color:#808030; '>,</span> <span style='color:#666616; '>std</span><span style='color:#800080; '>::</span><span style='color:#603000; '>string</span><span style='color:#800080; '>></span>  bop<span style='color:#800080; '>;</span>

        df<span style='color:#808030; '>.</span>single_act_visit<span style='color:#800080; '>&lt;</span><span style='color:#800000; font-weight:bold; '>double</span><span style='color:#808030; '>,</span> <span style='color:#800000; font-weight:bold; '>double</span><span style='color:#808030; '>,</span> <span style='color:#800000; font-weight:bold; '>double</span><span style='color:#808030; '>,</span> <span style='color:#800000; font-weight:bold; '>double</span><span style='color:#800080; '>></span><span style='color:#808030; '>(</span><span style='color:#800000; '>"</span><span style='color:#0000e6; '>IBM_Low</span><span style='color:#800000; '>"</span><span style='color:#808030; '>,</span> <span style='color:#800000; '>"</span><span style='color:#0000e6; '>IBM_High</span><span style='color:#800000; '>"</span><span style='color:#808030; '>,</span> <span style='color:#800000; '>"</span><span style='color:#0000e6; '>IBM_Open</span><span style='color:#800000; '>"</span><span style='color:#808030; '>,</span> <span style='color:#800000; '>"</span><span style='color:#0000e6; '>IBM_Close</span><span style='color:#800000; '>"</span><span style='color:#808030; '>,</span> bop<span style='color:#808030; '>)</span><span style='color:#800080; '>;</span>

        assert<span style='color:#808030; '>(</span>bop<span style='color:#808030; '>.</span>get_result<span style='color:#808030; '>(</span><span style='color:#808030; '>)</span><span style='color:#808030; '>.</span>size<span style='color:#808030; '>(</span><span style='color:#808030; '>)</span> <span style='color:#808030; '>=</span><span style='color:#808030; '>=</span> <span style='color:#008c00; '>1721</span><span style='color:#808030; '>)</span><span style='color:#800080; '>;</span>
        assert<span style='color:#808030; '>(</span><span style='color:#666616; '>std</span><span style='color:#800080; '>::</span><span style='color:#603000; '>abs</span><span style='color:#808030; '>(</span>bop<span style='color:#808030; '>.</span>get_result<span style='color:#808030; '>(</span><span style='color:#808030; '>)</span><span style='color:#808030; '>[</span><span style='color:#008c00; '>0</span><span style='color:#808030; '>]</span> <span style='color:#808030; '>-</span> <span style='color:#808030; '>-</span><span style='color:#008000; '>0.7636</span><span style='color:#808030; '>)</span> <span style='color:#808030; '>&lt;</span> <span style='color:#008000; '>0.0001</span><span style='color:#808030; '>)</span><span style='color:#800080; '>;</span>
        assert<span style='color:#808030; '>(</span><span style='color:#666616; '>std</span><span style='color:#800080; '>::</span><span style='color:#603000; '>abs</span><span style='color:#808030; '>(</span>bop<span style='color:#808030; '>.</span>get_result<span style='color:#808030; '>(</span><span style='color:#808030; '>)</span><span style='color:#808030; '>[</span><span style='color:#008c00; '>14</span><span style='color:#808030; '>]</span> <span style='color:#808030; '>-</span> <span style='color:#008000; '>0.4319</span><span style='color:#808030; '>)</span> <span style='color:#808030; '>&lt;</span> <span style='color:#008000; '>0.0001</span><span style='color:#808030; '>)</span><span style='color:#800080; '>;</span>
        assert<span style='color:#808030; '>(</span><span style='color:#666616; '>std</span><span style='color:#800080; '>::</span><span style='color:#603000; '>abs</span><span style='color:#808030; '>(</span>bop<span style='color:#808030; '>.</span>get_result<span style='color:#808030; '>(</span><span style='color:#808030; '>)</span><span style='color:#808030; '>[</span><span style='color:#008c00; '>18</span><span style='color:#808030; '>]</span> <span style='color:#808030; '>-</span> <span style='color:#008000; '>0.1591</span><span style='color:#808030; '>)</span> <span style='color:#808030; '>&lt;</span> <span style='color:#008000; '>0.0001</span><span style='color:#808030; '>)</span><span style='color:#800080; '>;</span>
        assert<span style='color:#808030; '>(</span><span style='color:#666616; '>std</span><span style='color:#800080; '>::</span><span style='color:#603000; '>abs</span><span style='color:#808030; '>(</span>bop<span style='color:#808030; '>.</span>get_result<span style='color:#808030; '>(</span><span style='color:#808030; '>)</span><span style='color:#808030; '>[</span><span style='color:#008c00; '>25</span><span style='color:#808030; '>]</span> <span style='color:#808030; '>-</span> <span style='color:#008000; '>0.6466</span><span style='color:#808030; '>)</span> <span style='color:#808030; '>&lt;</span> <span style='color:#008000; '>0.0001</span><span style='color:#808030; '>)</span><span style='color:#800080; '>;</span>
        assert<span style='color:#808030; '>(</span><span style='color:#666616; '>std</span><span style='color:#800080; '>::</span><span style='color:#603000; '>abs</span><span style='color:#808030; '>(</span>bop<span style='color:#808030; '>.</span>get_result<span style='color:#808030; '>(</span><span style='color:#808030; '>)</span><span style='color:#808030; '>[</span><span style='color:#008c00; '>1720</span><span style='color:#808030; '>]</span> <span style='color:#808030; '>-</span> <span style='color:#008000; '>0.9284</span><span style='color:#808030; '>)</span> <span style='color:#808030; '>&lt;</span> <span style='color:#008000; '>0.0001</span><span style='color:#808030; '>)</span><span style='color:#800080; '>;</span>
        assert<span style='color:#808030; '>(</span><span style='color:#666616; '>std</span><span style='color:#800080; '>::</span><span style='color:#603000; '>abs</span><span style='color:#808030; '>(</span>bop<span style='color:#808030; '>.</span>get_result<span style='color:#808030; '>(</span><span style='color:#808030; '>)</span><span style='color:#808030; '>[</span><span style='color:#008c00; '>1712</span><span style='color:#808030; '>]</span> <span style='color:#808030; '>-</span> <span style='color:#808030; '>-</span><span style='color:#008000; '>0.7341</span><span style='color:#808030; '>)</span> <span style='color:#808030; '>&lt;</span> <span style='color:#008000; '>0.0001</span><span style='color:#808030; '>)</span><span style='color:#800080; '>;</span>
        assert<span style='color:#808030; '>(</span><span style='color:#666616; '>std</span><span style='color:#800080; '>::</span><span style='color:#603000; '>abs</span><span style='color:#808030; '>(</span>bop<span style='color:#808030; '>.</span>get_result<span style='color:#808030; '>(</span><span style='color:#808030; '>)</span><span style='color:#808030; '>[</span><span style='color:#008c00; '>1707</span><span style='color:#808030; '>]</span> <span style='color:#808030; '>-</span> <span style='color:#808030; '>-</span><span style='color:#008000; '>0.5465</span><span style='color:#808030; '>)</span> <span style='color:#808030; '>&lt;</span> <span style='color:#008000; '>0.0001</span><span style='color:#808030; '>)</span><span style='color:#800080; '>;</span>

        bop_v<span style='color:#800080; '>&lt;</span><span style='color:#800000; font-weight:bold; '>double</span><span style='color:#808030; '>,</span> <span style='color:#666616; '>std</span><span style='color:#800080; '>::</span><span style='color:#603000; '>string</span><span style='color:#800080; '>></span>  bop2 <span style='color:#808030; '>(</span><span style='color:#800000; font-weight:bold; '>true</span><span style='color:#808030; '>)</span><span style='color:#800080; '>;</span>

        df<span style='color:#808030; '>.</span>single_act_visit<span style='color:#800080; '>&lt;</span><span style='color:#800000; font-weight:bold; '>double</span><span style='color:#808030; '>,</span> <span style='color:#800000; font-weight:bold; '>double</span><span style='color:#808030; '>,</span> <span style='color:#800000; font-weight:bold; '>double</span><span style='color:#808030; '>,</span> <span style='color:#800000; font-weight:bold; '>double</span><span style='color:#800080; '>></span><span style='color:#808030; '>(</span><span style='color:#800000; '>"</span><span style='color:#0000e6; '>IBM_Low</span><span style='color:#800000; '>"</span><span style='color:#808030; '>,</span> <span style='color:#800000; '>"</span><span style='color:#0000e6; '>IBM_High</span><span style='color:#800000; '>"</span><span style='color:#808030; '>,</span> <span style='color:#800000; '>"</span><span style='color:#0000e6; '>IBM_Open</span><span style='color:#800000; '>"</span><span style='color:#808030; '>,</span> <span style='color:#800000; '>"</span><span style='color:#0000e6; '>IBM_Close</span><span style='color:#800000; '>"</span><span style='color:#808030; '>,</span> bop2<span style='color:#808030; '>)</span><span style='color:#800080; '>;</span>

        assert<span style='color:#808030; '>(</span>bop2<span style='color:#808030; '>.</span>get_result<span style='color:#808030; '>(</span><span style='color:#808030; '>)</span><span style='color:#808030; '>.</span>size<span style='color:#808030; '>(</span><span style='color:#808030; '>)</span> <span style='color:#808030; '>=</span><span style='color:#808030; '>=</span> <span style='color:#008c00; '>1721</span><span style='color:#808030; '>)</span><span style='color:#800080; '>;</span>
        assert<span style='color:#808030; '>(</span><span style='color:#666616; '>std</span><span style='color:#800080; '>::</span>isnan<span style='color:#808030; '>(</span>bop2<span style='color:#808030; '>.</span>get_result<span style='color:#808030; '>(</span><span style='color:#808030; '>)</span><span style='color:#808030; '>[</span><span style='color:#008c00; '>0</span><span style='color:#808030; '>]</span><span style='color:#808030; '>)</span><span style='color:#808030; '>)</span><span style='color:#800080; '>;</span>
        assert<span style='color:#808030; '>(</span><span style='color:#666616; '>std</span><span style='color:#800080; '>::</span>isnan<span style='color:#808030; '>(</span>bop2<span style='color:#808030; '>.</span>get_result<span style='color:#808030; '>(</span><span style='color:#808030; '>)</span><span style='color:#808030; '>[</span><span style='color:#008c00; '>12</span><span style='color:#808030; '>]</span><span style='color:#808030; '>)</span><span style='color:#808030; '>)</span><span style='color:#800080; '>;</span>
        assert<span style='color:#808030; '>(</span><span style='color:#666616; '>std</span><span style='color:#800080; '>::</span><span style='color:#603000; '>abs</span><span style='color:#808030; '>(</span>bop2<span style='color:#808030; '>.</span>get_result<span style='color:#808030; '>(</span><span style='color:#808030; '>)</span><span style='color:#808030; '>[</span><span style='color:#008c00; '>13</span><span style='color:#808030; '>]</span> <span style='color:#808030; '>-</span> <span style='color:#808030; '>-</span><span style='color:#008000; '>0.0328</span><span style='color:#808030; '>)</span> <span style='color:#808030; '>&lt;</span> <span style='color:#008000; '>0.0001</span><span style='color:#808030; '>)</span><span style='color:#800080; '>;</span>
        assert<span style='color:#808030; '>(</span><span style='color:#666616; '>std</span><span style='color:#800080; '>::</span><span style='color:#603000; '>abs</span><span style='color:#808030; '>(</span>bop2<span style='color:#808030; '>.</span>get_result<span style='color:#808030; '>(</span><span style='color:#808030; '>)</span><span style='color:#808030; '>[</span><span style='color:#008c00; '>18</span><span style='color:#808030; '>]</span> <span style='color:#808030; '>-</span> <span style='color:#808030; '>-</span><span style='color:#008000; '>0.0743</span><span style='color:#808030; '>)</span> <span style='color:#808030; '>&lt;</span> <span style='color:#008000; '>0.0001</span><span style='color:#808030; '>)</span><span style='color:#800080; '>;</span>
        assert<span style='color:#808030; '>(</span><span style='color:#666616; '>std</span><span style='color:#800080; '>::</span><span style='color:#603000; '>abs</span><span style='color:#808030; '>(</span>bop2<span style='color:#808030; '>.</span>get_result<span style='color:#808030; '>(</span><span style='color:#808030; '>)</span><span style='color:#808030; '>[</span><span style='color:#008c00; '>25</span><span style='color:#808030; '>]</span> <span style='color:#808030; '>-</span> <span style='color:#808030; '>-</span><span style='color:#008000; '>0.0421</span><span style='color:#808030; '>)</span> <span style='color:#808030; '>&lt;</span> <span style='color:#008000; '>0.0001</span><span style='color:#808030; '>)</span><span style='color:#800080; '>;</span>
        assert<span style='color:#808030; '>(</span><span style='color:#666616; '>std</span><span style='color:#800080; '>::</span><span style='color:#603000; '>abs</span><span style='color:#808030; '>(</span>bop2<span style='color:#808030; '>.</span>get_result<span style='color:#808030; '>(</span><span style='color:#808030; '>)</span><span style='color:#808030; '>[</span><span style='color:#008c00; '>1720</span><span style='color:#808030; '>]</span> <span style='color:#808030; '>-</span> <span style='color:#808030; '>-</span><span style='color:#008000; '>0.1183</span><span style='color:#808030; '>)</span> <span style='color:#808030; '>&lt;</span> <span style='color:#008000; '>0.0001</span><span style='color:#808030; '>)</span><span style='color:#800080; '>;</span>
        assert<span style='color:#808030; '>(</span><span style='color:#666616; '>std</span><span style='color:#800080; '>::</span><span style='color:#603000; '>abs</span><span style='color:#808030; '>(</span>bop2<span style='color:#808030; '>.</span>get_result<span style='color:#808030; '>(</span><span style='color:#808030; '>)</span><span style='color:#808030; '>[</span><span style='color:#008c00; '>1712</span><span style='color:#808030; '>]</span> <span style='color:#808030; '>-</span> <span style='color:#808030; '>-</span><span style='color:#008000; '>0.0729</span><span style='color:#808030; '>)</span> <span style='color:#808030; '>&lt;</span> <span style='color:#008000; '>0.0001</span><span style='color:#808030; '>)</span><span style='color:#800080; '>;</span>
        assert<span style='color:#808030; '>(</span><span style='color:#666616; '>std</span><span style='color:#800080; '>::</span><span style='color:#603000; '>abs</span><span style='color:#808030; '>(</span>bop2<span style='color:#808030; '>.</span>get_result<span style='color:#808030; '>(</span><span style='color:#808030; '>)</span><span style='color:#808030; '>[</span><span style='color:#008c00; '>1707</span><span style='color:#808030; '>]</span> <span style='color:#808030; '>-</span> <span style='color:#808030; '>-</span><span style='color:#008000; '>0.0102</span><span style='color:#808030; '>)</span> <span style='color:#808030; '>&lt;</span> <span style='color:#008000; '>0.0001</span><span style='color:#808030; '>)</span><span style='color:#800080; '>;</span>
    <span style='color:#800080; '>}</span>
    <span style='color:#800000; font-weight:bold; '>catch</span> <span style='color:#808030; '>(</span><span style='color:#800000; font-weight:bold; '>const</span> DataFrameError <span style='color:#808030; '>&amp;</span>ex<span style='color:#808030; '>)</span>  <span style='color:#800080; '>{</span>
        <span style='color:#666616; '>std</span><span style='color:#800080; '>::</span><span style='color:#603000; '>cout</span> <span style='color:#808030; '>&lt;</span><span style='color:#808030; '>&lt;</span> ex<span style='color:#808030; '>.</span>what<span style='color:#808030; '>(</span><span style='color:#808030; '>)</span> <span style='color:#808030; '>&lt;</span><span style='color:#808030; '>&lt;</span> <span style='color:#666616; '>std</span><span style='color:#800080; '>::</span><span style='color:#603000; '>endl</span><span style='color:#800080; '>;</span>
    <span style='color:#800080; '>}</span>
<span style='color:#800080; '>}</span>
</pre>
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